Pattern recognition apparatus and method
US4200861A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 1, 1978 |
| Grant date | Apr 29, 1980 |
| Priority date | — |
| Expiry date | Sep 1, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V30/2504
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Video informatin obtained in real time is clocked and digitized according to light intensity. Changing light intensities are adaptively determined to vary the threshold level for determining black and white signals. The scene to be used as a reference is first recorded in a fine format and then in a coarse format. In the search mode the coarse stored information is compared in real time with coarse information from the field of view and convolved to generate a correlation number indicating the percentage of match. The location coordinates in the X and Y dimension for the best match is determined at the location of the highest correlation number. A fine search is then made around the coarse location previously determined by convolving in two dimensions previously stored information against information in real time from the scene under investigation to again determine the highest correlation as a measure of the location where the best possible match can be determined.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.